GRE Sample Test 2 Quantitative Reasoning 1

Africa’s population is 10.6 percent on the pie chart; South America’s is 7.9 percent.
Right away, you can eliminate all of the answer choices that are smaller than 368. Now you are left with (A) and (B). Because the question gives you South America’s population (368 million), you can use a proportion to find the population of Africa. The proportion would look like this:

0.079

368

=

0.106

x

, where x is equal to the population of Africa. Cross multiplying gives you 0.079x = 0.106 × 368, so x = 493.7.